40138689593 has 2 divisors, whose sum is σ = 40138689594. Its totient is φ = 40138689592.

The previous prime is 40138689583. The next prime is 40138689611. The reversal of 40138689593 is 39598683104.

It is a happy number.

40138689593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22054626064 + 18084063529 = 148508^2 + 134477^2 .

It is a cyclic number.

It is not a de Polignac number, because 40138689593 - 2⁶ = 40138689529 is a prime.

It is a super-2 number, since 2×40138689593² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40138689553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069344796 + 20069344797.

It is an arithmetic number, because the mean of its divisors is an integer number (20069344797).

Almost surely, 2^40138689593 is an apocalyptic number.

It is an amenable number.

40138689593 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138689593 is an equidigital number, since it uses as much as digits as its factorization.

40138689593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 40138689593 in words is "forty billion, one hundred thirty-eight million, six hundred eighty-nine thousand, five hundred ninety-three".